91810841 has 2 divisors, whose sum is σ = 91810842. Its totient is φ = 91810840.

The previous prime is 91810813. The next prime is 91810847. The reversal of 91810841 is 14801819.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65545216 + 26265625 = 8096^2 + 5125^2 .

It is a cyclic number.

It is not a de Polignac number, because 91810841 - 2²² = 87616537 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 91810798 and 91810807.

It is not a weakly prime, because it can be changed into another prime (91810847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45905420 + 45905421.

It is an arithmetic number, because the mean of its divisors is an integer number (45905421).

Almost surely, 2^91810841 is an apocalyptic number.

It is an amenable number.

91810841 is a deficient number, since it is larger than the sum of its proper divisors (1).

91810841 is an equidigital number, since it uses as much as digits as its factorization.

91810841 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 32.

The square root of 91810841 is about 9581.7973783628. The cubic root of 91810841 is about 451.1261358456.

The spelling of 91810841 in words is "ninety-one million, eight hundred ten thousand, eight hundred forty-one".